Roof Ridge Sag

In a stick frame non truss sloped roof these issues usually cause the roof ridge to sag in the middle giving it a swayback look but can also cause one side of the roof to sag.

Roof ridge sag.

A ridge that droops in the middle forming that unintentional western design feature likely is due to undersized rafters and or missing or inadequate internal bracing rafter or collar ties. A sagging roof can come in one of a few classic forms each with its own cause. Some roofs sag because of decay to the inside beams and sheathing. When you have undersized rafters or inadequate storm bracing snow or ice resting on your roof may cause it to sag.

Installing new rafters directly alongside the weak or damaged ones is often enough to correct this problem. Decay can occur over time due to a number of reasons including leaks in the roof or leaks from guttering or downpipes wet rot or even insect attacks such as termites damaging the ends of the bearings. On initial review of the garage roof interior our expert immediately saw the cause of the garage roof bowing. The ridge board was cracked and sagging.